Pneumatic tire.



M. C. OVERMAN.

PNEUMATIC TIRE. APPLICATION FILED IULY22. 1914. 1,177,048. Patented Mar. 28,1916.

2 SHEETS-SHEET I.

M. C. OVERMAN.

PNEU

APPLICATION FILED JULY 22. 1914.

MATH TIRE.

0n 1 9 1 00 2 R a M d m m P 2 SHEETS-SHEET 2- i ti will 5 it a i MAX CYRUS OVEBMAN, OF NEW YORK, N. Y.

PNEUMATIC TIRE.

'1 0 all whom it may concern Be it known that 1', MAX CYRUS OVERMAN, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Pneumatic Tires, of which the following is a specification.

My, present invention relates to a pneu matic tire having a deep nose-portion with deep tread clefts therein, containing a special tire within my invention,-Fig. 2 is a cross sectional view on the line 22 in Fig. 3, which latter is a plan view of thetread of the same tire; Fig. 4 is a perspective View on an enlarged scale compared to the previous figures, of one of the cores or inserts used in the manufacture of this tire for forming one of the transverse grooves, together with the pebble ejecting projections; Fig. 5 is an underneath View of the same insert, namely, a view looking at it in the direction of the arrow in Fig. l; Fig. 6 is a similarly enlarged-perspective view of one of the cores or inserts used by forming the recesses 7 and Fig. 7 is a section on the line 77 in Fig. 5.

I will now describe the specific devices of the drawings, reserving it to the claims to point out the novel features and to define the scope of the invention, it being understood that the claims will be given the due range of equivalents to which they may be entitled in view of the art.

The expressions herein directed to the up and down relationship of the parts of the tire refer to a section of the tire positioned as if in ground contact as in Fig. 2.

1 is a protective shoe for the inner tube (not shown) of a pneumatic tire. It comrises the ordinary fabric carcass 2 and my improved, nose-portion 3 greatly thickened Specification of Letters Patent.

Application filed July 22, 1914. Serial No. 852,407.

Patented Mar. 28, 1916.

as compared with the ordinary shoe, thereby so far separating the tread of the shoe from the inner tube as to minimize the liability of puncture.

4 is a fabric breaker strip. The nose portion maybe made of the regular pneumatic tire tread stock or any other rubber compound or compounds suitable for the purpose. 5-5 are frequently occurring grooves substantially as deep as the nose-portion, extending alternatively from the sides of the shoe past the center of the tread (compare the plan view Fig. 3) in order to overlap each other. Said grooves become increaslngly wide as they approach the tread and are especially wide at said tread. In this way, the deep nose-portion is sub-divided into numerous load-supporting parts 6 having fiexibilities and abilities to flow and yield in every direction, longitudinally or laterally, thereby assisting in preventing the deep nose-portion from being torn off the carcass, when the tire is in action.

7-7 are large area recesses or weakenings formed in the sides of the respective loadsupporting parts 6. These recesses are deepest at a zone located between their top and bottom boundaries 8 and 9, and thence graduate in depth toward said boundaries and also graduate in depth toward their said boundaries; and at these boundaries the bottoms of the recesses meet with the rounded surface of the tire. Further, the side boundaries 10-10 of the individual recesses converge toward the tread.

The relatively massive nose-portion of my tire would throw undue bending work on the upper side walls, were it not for these large area recesses 7--7, which, as will be seen from a consideration of Fig. 2, act to distribute the bending so that it occurs throughout the height of the side walls of the tire instead of concentrating destructively in any one zone in said walls. Further, by permitting an easy distribution of the stresses created in the tire when in action, these same recesses 7 co'tiperate with the grooves 5 in preventing the nose-portion from tearing loose from the carcass.

11-11 are pebble ejecting nipples or projections extending integrally from the bottom and sides of each groove 5. Their bases are merged with one another and with the walls of each groove by connecting fillets 12 which perform the important service of preventing the bending strains on the loadsupporting parts 6 from creating breaks or cracks through the relatively thin layer of nose material forming the bottoms of the grooves 5. It is important to avoid these cracks because, should they occur, water will get through them into the fabric of the car'- cass and will rot it. Further, these same connecting fillets create under load a condition of mutual support not only between the individual projections 111 1 but also through them; between the long walls of the grooves 5"so that adjacent load-supporting parts 6 are just enough tied together under load to make them act together "as a unit (which is advantageous from the pointof view of wear and firmness and steadiness of support) withoutimpairing the advanta geous qualities heretofore referred to for which the grooves 5 are provided.

15in Figs. 4 and 5 is the core or insert used in the manufacture of the tire for forming one of the grooves 5 with the projections 11 and the fillets 12. Whenused to make one of said grooves in the tire,' the portion 15 of the insert is locatedat the central tread-portion of the tire in course of manufacture, and the portion 15 is lo cated at the side of the 'tire,whereas the recesses 15 form the projections or nipples 11 and the fillets I2.

16 in Figs. 6 is a face view of the insert I ,,used 1n forming one ofthe recesses 7 and Fig; 7 is a sectionof the same on the line 77 in Fig. 6. The concealed face'o'f this insert inliig. 5 being the curved face 16* in Fig. 7, is located at the curved outer periphery of the tire beingmanufactured;

Copies of this patent nay he obtained for whereas 11 is the lower bottom portion and 11 its upper bottom portion.

What I claim is 1. A pneumatic tire comprising a carcass and a rubber nose-portion divided by frequent grooves into yielding load-supporting parts, each of said grooves containing projections whose bases are filleted and merged with one another and with the walls of the grooves.

'2. A pneumatic tire comprising a carcass and a deep/rubber nose-portion divided by frequent grooves substantially as deep as the nose-portion into yielding load-supporting parts, each of said grooves containing projectionswhose bases are filleted' and merged with one another and with the-walls of the grooves. I i 4 3. A pneumatic tire comprising a carcass and a deep rubber nose-portion divided by frequent transverse grooves substantially as deep asthe nose-portion into yieldingloadsupporting parts, each of said' grooves containing projections whose bases are filleted and merged with one another and with the walls of the grooves.

4. A'pneumatic tire having a nose portion provided with groovesforming yielding load supporting' parts, spaeed over "lapping projections in the grooves springing alter nately from the opposite Walls thereof, and fillets connecting the bases of the overlapping portions of said projections'f' 3 In testimony whereof lhaveafiixed my signature in-the presence of'twowitnesses.

' MAX CYRUS OVERMAN. Witnesses:

HOWELL D. BOYD,

E. SCHERR, r.

five cents each, by addressing the Commissioner of Patents,

Washington, .D. G. 

